I take the damaged/pitted ones and fill 'em in with the welder. I also don't shoot 'em less than 300yds. Varmit and match bullets in .224 just knock the paint off at that distance. .264 & .308 are another story.
A friend shot some steel core rounds at 500yds just for kicks. We found a core stuck in the steel target like a dart in a dartboard (half in,half out)!

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James